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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27517c782de49d80118d7722e6f2f4751ff6289aee311ef8b94084f756843e5c' 
  AND token = 'R9GvuckYKiu1UfwR8BPz5sxb3+17aBzGvSmBop9YzNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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