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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fa428c3e34dc278443cf6201a8f4d788c5b92a4c89034685fa8394eaedaa6a3' 
  AND token = '1BvcX+jJIYG+Q6/8XH6xGXMM9xzLG0yAOHxk9mteriI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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