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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd7a2960602ef1fa29595d11ee9d78d5d3257068f1b2f5de1ac8e2f737d1ae7e' 
  AND token = 'ZcJK6IuX7tHZJzxL7Q/MO2wQA6Et8zw21rG5Js3pbAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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