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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baa36a11cf53b96ebd6e796dfb9d22818f635f019c2bb43be7639d39a4d4d488' 
  AND token = 'DtPc7WN29vwl8r0H4fzT2W2wc1AHYtjZn62ifXsddtk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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