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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f47cbb3d6297b1e2dd87d45ac0adb46fced22de5c0f7c63c20f15812334eb9c6' 
  AND token = 'vdXoPu6xQgeArnitYdh6yxv6G8W9s+3Yv/o2EnTNU9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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