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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee28b13ea5227116f96b8ce5065c12ed5aa9ed536ab2df6447871ef5c3cb9e19' 
  AND token = 'KT2nMS7D+Jjj4JwjjX06XwHson70f25VjpR6EboLZ4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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