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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '244110f0e81895c3ac26a310df848bf43dcdf13dc8bbf8a74542d45fbbb46fb6' 
  AND token = 'DaQzFzq2ececVRXDHJUfBfowBWNz8A5U992ME8c1T4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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