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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'beb884c8b0e30e0ac369e8e6915e86a1ca6cac71350abc437082f3675104e35b' 
  AND token = 'HPY1UNiCknuO154q9xwn33Jsl9o6vBVhB2VxzXLClyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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