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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bbb025859271a5bd6738abf1b6eeb8a976bb87b43156565f57b3a98cb8a368e' 
  AND token = 'zk9x9VcV8OD5o5KCglGNVp4MGGWaiSyWQ4KXtwxSPWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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