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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03bc22f75682db7e97a3de9956fde700a900d8d0d6ebae49fc6a6676ad9058ed' 
  AND token = 'P9YQvP0+d1LS2T0Ik/j88vxxrLyIMZg37TEAz7TK324=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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