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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8f9412e19bbd8d4b8a57b1ac11d29b32cfd6d5353e6c4a0970ab6bcb113f857' 
  AND token = 'Obbf3mXQwdqDNM6/U33Lti5Di/ppoubhe13RCdVXPes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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