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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70e67cf32a94ed696cddfad16a21156f5f3c4ad4b814bc2c34c5c1d730af0cf4' 
  AND token = 'L4gdBp4WJkmQcCPW+FIXlOQx4Hr7N+9qnjKHJ+qL8iY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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