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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db797db03b05c01f89d62e318188746eae9e31f999fae0fa983e3feebc62a734' 
  AND token = 'Sv7SwFHIXF8gmB4Sw1psh0CYKYniM6UUJATpA7vwDV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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