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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a076d477205e9103bfda5d37494f56389661ed67eb18f63bdc587aa2e0e88da' 
  AND token = 'UWS143XRxfunMYW0pY7ZvdEOC12YZQWXwbZT2QRzRVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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