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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbbce2320f318607b62a9b619beaec30a64cf30f74cc15f9360cf86236b8c585' 
  AND token = '0GQUokTyD3ON3JrgdljaJjdviYYPU+tUSB6t2gJ8k2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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