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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a93c6e64a04de303c156efff2b20db7dbbc7bc526a510e2867a4b6d3250aa4c' 
  AND token = 'dleLDTXNi3ZUKi0TMpf1M/JOL/jYk1Iv7LPr+UmkRtg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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