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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab09fe0042f87f98553c02a645e8bfd76ccc49ffb14b84121583c1822aaceed0' 
  AND token = 'dCnsDp7EuKpcdZ9u77Pb+ITgqSrPwlsiSHTMGroz4QY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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