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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '120d765b313e92c56877e72b9394cd279c38c25c7a4e940f83e78ae04ece479b' 
  AND token = 'wLQ2AVaLdMtVBVTHfNXe725JJ+ZxmorQJrOjUZqZfoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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