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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a734606ef7d75a9e695952305806a2bedc9dff0477131d651a6d49886eab3beb' 
  AND token = 'rPQCyqGqSVyaL684Fwg3uugLK9ysE64bNvTFvcW4mJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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