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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d2dacebfc0f9cf15471f2719e86c19faf37ddab8f23b6b6fa444f4cdd4822dc' 
  AND token = 'jYwlc2U5giR5KbwFRJjvzIJYjJNKfTcjAXSI7urCEMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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