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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3a08b508598c7c6b3fce9e738cc8a90ceb5a0b92a72ca165ca5df4a67faa53c' 
  AND token = 'MMXOvQLHMCO6WCKLza5k3iGwUS0gwsbVKFCDcJxu/Vg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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