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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e55d12afbb88e50a54082d389c8527397377c4fa4b7c47d273d591e38f658e54' 
  AND token = 'oQ7H2hJDaqJ014tfuNwPYdwnVKhE7XDGYvaT5Qt+wOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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