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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee4fbd242d58a6ec001495fdf3d2cb948c6f69b291eb0e0bf62ead0cc9cd4105' 
  AND token = 'pVH+iovu12Fj68ReODpjn2zhfuZDqpGSEOzrzI1ySaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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