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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cebf3dadee3bf58cb216232094eaadccb979a9f2194e6156d0f6ed44eae9b561' 
  AND token = 'NKsN2X99Oikm4j1DJ1dOwrr+4eh+hSTQCpBJA1Jt1QY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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