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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfb8b4424cb123d82309a0910b78fe8c5f065c99dc6b8eb07648152f70f9e011' 
  AND token = 'XCg+jUU5wy9k887+ICNhB6RC6i8pd4XEi5Oi9AhYvaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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