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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9b0c8f05d00e65e3f8e03860a1b66e81250d400403c193737507cbc2a66fc23' 
  AND token = '/5E1KrhuRKQwUXUzJ72odEX9bfR9+fDdaSWPzSSqo9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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