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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b4141107e3bfd0c3e7e41c7baaa1ef97b7e6085ee84261ca057e7c0dd309e08' 
  AND token = 'ukKVkWxMAJiKXDIc+dPSyMN9j8+eRPvUuq6kSSGL99g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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