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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddca3178ab64e4ed9f8d98b9cc5259580f1484efe25c9dc6694efddd8995cb0b' 
  AND token = 'Qds4pbbHHX67nv03HHMM09w4BLUX3to8Nofz5uOm5pU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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