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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a69273c5c0adc653d1d96b601e2b75f5186ca1c32663d5bd3f5667a66a83ef2' 
  AND token = 'x1LqL/5Cmu0U0kjMYBjlu5oE6pihqPr2gYuPyXEcW7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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