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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4ce2bf80f4f1a86c16236bf3918bbbccf0fba94654d614f9a7a2900761371fd' 
  AND token = 'sfRdEQSoy2TSz28QFncLGzu/JXbLqzlN71OWyg2dhGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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