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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc2ed7d62f9058271c2bee7c72a9b4e0812e92af5cbf30c436384c24bb5c42dd' 
  AND token = '3JZp6bGlgchWgtE4n6RUbfJfK5gQYPJqxJCQJN/hEW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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