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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a09e7df0331f609b140a093f3dfdff80f4dcf1253e70d4399f32a19118a54ef1' 
  AND token = 'bxex9OE7D7tGVDHOZT0gECeQii591OwEcH/VZgzgeAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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