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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f34c2c9c5441ee04bbf38d17598a37b73c98943483b1348605c7c5b40ed75f9' 
  AND token = 'SE9gIdjKaXAK+duX9qcA4u8eosOUlyWBRY6HUuXOB6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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