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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6144491b946495f582d111128ecd4d5223dd01fc598762d3f8fbc7e6a1a1a2b' 
  AND token = 'DhPRBNQ1lu4fm7wuDqU9DjzZXQaFXNLdb6iN3eFo1Hk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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