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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ea4c964e98014aab4dfe2377a01dc4c94d5d2476aafc979e9e0b65fd1ebd95e' 
  AND token = 'W9VaCs9svRfFQDq/Dz/EU2/sajbUTMaEDS3Mj9+gKd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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