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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e117cb301cad88a535efb8741cb053d10c7cbee1f89c7b92aee85cbc3060407f' 
  AND token = 'qoHV/mrK5RZQ6UzFWOPRa7YfbiFmyIha+Cc1gwqyFRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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