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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b18e9ff2769e351e4dfdf70a649dcad9e52b5cde92d1b7499b972d8d5fe0d883' 
  AND token = '3wwGxxjKEljA6CAGLl08bUab745b0OsfXFnJk5n7Qkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}