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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb402280a5b9ad2359153f427e6f2508947b6231427ac24bd502cb45ab9b3bd8' 
  AND token = '7mHRrzH3E88CHlqB/yukiYW5C0MTnLZq1RHh1t8Es9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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