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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7748fc9e4e4441d6e6972cb594b42323f16005ec0cb75a1d9e4a0011358936b8' 
  AND token = 'L2ZkFQZfkGn36Dg/wT3AVK8BI74k9nFqqylS1Ml34WA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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