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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '094aca6e1cd5d88dc4d4cf5a7a2c378f8ab33713af7c2de20b3bc8e165133319' 
  AND token = 'FMLI4iol0Y5C6ldh6fDTvMHnJ862R5WqqtK9cZ8Qbtc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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