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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0792e14b4869e6dcfdbeae283f5a7ed33a5f47ef02737dfe0c0deed40dec9d5' 
  AND token = 'YT5hVGIRMO6l0TiM/6kBHUYVT8zVDoCSVHZ0q9MS48U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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