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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39e6bfff79dff31d3c98b5e7f00bb2f3aa5de3e790161c9dca3611cacc6ce775' 
  AND token = 'FpBabmOm3JhI5zbJdGiK6uCkgYbY61Evyt2olmgtfMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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