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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f761e1946deb0883d1eb47d871c4ec481cff0ede14b4d00c2e144a9fd2de0bb3' 
  AND token = 'RaEoDb9FXNJm5h2GI8da3e1gp3YI3yMqfQ6g9G9Uutw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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