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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17552ccf9e1ed8ca9042e67f8b6554ddab3566ad92a8f8a11e931480455e6335' 
  AND token = 'N2L8gchRbsxTo5MdtvPMZMThjnLxE3zg7M7delO5vms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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