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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '190f676f2abc4441c6e9191057d604e185a3c356dd4dcd642e558e6efb16405c' 
  AND token = '/QIthQQgyf7VoK14NJvR9LhIZFl+nnXJXWp8IPlZfEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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