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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5db031e97d3e51f0a92ac676dba4e85ba4d076bd56f26adef94999dfbd43c97' 
  AND token = 'ZL104VRSeLJa/YODsenEgniNvKXQwrS+GieJ2DNSKgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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