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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b2dce60dcb07d03ff62aeb4dc717d4a01ba0245ad0b2471f464f2a6a1f02c99' 
  AND token = 'B62u2kKtnTpid8/kcp8FkaIhw7Vmi/CUNd1JoLxnkfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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