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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0297469c902310db0def4b29c339ca53f387533f86a708ad2e78c7e96aedf4ec' 
  AND token = 'pM5FIsxGH1k99sGPLOL05av/hj9HJXtvLM9VMeDImQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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